package com.bunkeystudio;

import java.io.IOException;
import java.util.List;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.util.Log;
import android.view.Display;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;

public class Viewfinder extends ViewGroup implements SurfaceHolder.Callback {
    private final String TAG = "Preview";

    SurfaceView		_surfaceView;
    SurfaceHolder	mHolder;
    Size			mPreviewSize;
    List<Size>		mSupportedPreviewSizes;
    Camera			_camera;
    Context			_context;

    public Viewfinder(Context context) {
        super(context);

        _context = context;
        _surfaceView = new SurfaceView(context);
        addView(_surfaceView);

        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = _surfaceView.getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }
        
    public void setCamera(Camera camera) {
        _camera = camera;
        if (_camera != null) {
        	/*Camera.Parameters params = _camera.getParameters();
        	params.setPictureFormat(PixelFormat.JPEG);
        	_camera.setParameters(params);     */   	
        	
            //mSupportedPreviewSizes = _camera.getParameters().getSupportedPreviewSizes();
            requestLayout();
        }
    }   
    
    public void setCameraDisplayOrientation() {
        /*CameraInfo info = new CameraInfo();
        Camera.getCameraInfo(cameraId, info);*/

        Display display = ((WindowManager) _context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
        int rotation = display.getRotation();
        int degrees = 0;
        switch (rotation) {
            case Surface.ROTATION_0: degrees = 0; break;
            case Surface.ROTATION_90: degrees = 90; break;
            case Surface.ROTATION_180: degrees = 180; break;
            case Surface.ROTATION_270: degrees = 270; break;
        }

        int result;
        /*if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {*/
            result = (0/*info.orientation*/ + degrees) % 360;
            result = (360 - result) % 360;  // compensate the mirror
        /*} else {  // back-facing
            result = (info.orientation - degrees + 360) % 360;
        }*/
        _camera.setDisplayOrientation(result);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // We purposely disregard child measurements because act as a
        // wrapper to a SurfaceView that centers the camera preview instead
        // of stretching it.
        final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        setMeasuredDimension(width, height);

        final int square = width > height ? height : width;
        
        if (mSupportedPreviewSizes != null) {
        	
            mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, square, square);
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        if (changed && getChildCount() > 0) {
            final View child = getChildAt(0);

            final int width = r - l;
            final int height = b - t;
            
            int size = width > height ? height : width;

            int previewWidth = size;
            int previewHeight = size;
            if (mPreviewSize != null) {
                previewWidth = mPreviewSize.width;
                previewHeight = mPreviewSize.height;
            }

            // Centering the child SurfaceView within the parent.
            if (width * previewHeight > height * previewWidth) {
                final int scaledChildWidth = previewWidth * height / previewHeight;
                child.layout((width - scaledChildWidth) / 2, 0,
                        (width + scaledChildWidth) / 2, height);
            } else {
                final int scaledChildHeight = previewHeight * width / previewWidth;
                child.layout(0, (height - scaledChildHeight) / 2,
                        width, (height + scaledChildHeight) / 2);
            }
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, acquire the camera and tell it where
        // to draw.
        try {
            if (_camera != null) {
                _camera.setPreviewDisplay(holder);
            }
        } catch (IOException exception) {
            Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // Surface will be destroyed when we return, so stop the preview.
        if (_camera != null) {
            _camera.stopPreview();
            _camera.release();
            _camera = null;
        }
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // Now that the size is known, set up the camera parameters and begin
        // the preview.
        /*Camera.Parameters parameters = _camera.getParameters();
        parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);

        requestLayout();

        _camera.setParameters(parameters);*/
        _camera.startPreview();
    }
    
    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) w / h;
        if (sizes == null) return null;

        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        // Try to find an size match aspect ratio and size
        for (Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        // Cannot find the one match the aspect ratio, ignore the requirement
        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }
}